KCSE 2014 Electricity Paper 2 Questions with Marking Scheme

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QUESTIONS

EXERCISE 1
Use the circuit, equipment and component provided to perform the following tasks.

  1. Connect the resistors labelled A across point X and Y of the circuit.
  2. Set the stopwatch to zero.
  3. Press switch S until voltage reading settles at about 10V.
  4. Release push button switch S and time the duration it takes for the voltage to drop to about 3-7 V and record the time in Table 1.
    Table 1
    Resistor 
    Time(s)          
  5. Repeat tasks (a) to (d) for each of the resistors B, C, D and E.(12 marks)
  6. Use schematic symbols to draw the circuit and label the components.(6 marks)
  7. From the results obtained, calculate the value of resistor labelled E.(2 marks)

EXERCISE 2
Using the materials, tools and equipment provided, fabricate the candle stand shown in figure 1. Its dimensions are given in the layout. (20 marks)
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Figure 1

EXERCISE 3
Using the components, materials and equipment provided, perform the following tasks.

  1. Connect the circuit shown in figure 2 and let the examiner check your work.(6 marks)
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    Figure 2
  2. Close the switch. Adjust the potentiometer to obtain voltage reading shown in Table 2. For each voltage obtained, measure and record the corresponding current values.(5 marks)
    Table 2
    Voltage (v) 0 0.5 0.7 0.9 1.3 1.7
    Current(mA)            
  3. Plot a graph of current against voltage.(6 marks)
  4. From the graph:
    1. determine the resistance when the voltage is 1.3 V;
    2. give a reason for the shape of the graph.(3 marks)

EXERCISE 4
Using the pre-fabricated circuit provided in figure 3, perform the following tasks:
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Figure 3

  1. With the switch open:
    1. connect the milliameter between A and B. (observe the polarity).
    2. connect the voltmeter between C and D. (observe the polarity).(2 marks)
      (Let the examiner check your work)
  2. Close the switch
    Adjust the variable resistor to obtain the current values in Table 3 and in each case measure and record the corresponding voltage values.(10 marks)
    Table 3
    Current(mA)  10 
    Voltage(v)          
  3.                        
    1. Plot the graph of current against voltage.
    2. Use the graph to determine the value of current when the voltage is 5.5 V.(8 marks)

EXERCISE 5
Figure 4 shows a lighting circuit. Using materials, tools and equipment provided, instal the circuit such that the switch controls the lamp. (20 marks)
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Figure 4

Marking Scheme

 

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